Download Arctic Shorebirds in North America : a Decade of Monitoring by Jonathan Robert Bart, Victoria Helen Johnston PDF

By Jonathan Robert Bart, Victoria Helen Johnston

ISBN-10: 0520273109

ISBN-13: 9780520273108

Each yr shorebirds from North and South the US migrate hundreds of thousands of miles to spend the summer time within the Arctic. There they feed in coastline marshes and estuaries alongside one of the most effective and pristine coasts anyplace. With lots to be had meals they can reproduce nearly explosively; and as iciness ways, they retreat south in addition to their offspring, to come to the Arctic the subsequent spring. This extraordinary development of circulation and task has been the thing of extensive examine through a world group of ornithologists who've spent a decade counting, surveying, and staring at those shorebirds. during this very important man made paintings, they tackle a number of questions about those migratory poultry populations. what number birds occupy Arctic ecosystems every one summer season? How lengthy do vacationing shorebirds linger earlier than heading south? How fecund are those birds? the place precisely do they migrate and the place precisely do they go back? Are their populations starting to be or shrinking? the result of this research are the most important for greater knowing how environmental rules will impression Arctic habitats in addition to the far-ranging wintry weather habitats utilized by migratory shorebirds.

Show description

Read Online or Download Arctic Shorebirds in North America : a Decade of Monitoring PDF

Similar zoology books

The Wild Cat Book: Everything You Ever Wanted to Know about Cats

From the traditional Egyptian cat goddess, Bastet, to the prophet Muhammad’s favourite cat, Muezza, and our modern obsession with on-line cat movies, pussycats have lengthy held a spot of honor of their human counterparts’ houses and cultures. however the household cat is only one of many tom cat species, and within the Wild Cat publication cat specialists Fiona and Mel Sunquist introduce us to the total panoply of the purring, roaring tom cat tribe.

Horses (First Step Nonfiction - Farm Animals)

Take a trip to the farm and know about the positive aspects and roles of a horse.

Boom and Bust: Bird Stories for a Dry Country

Winner of the 2009 Whitley MedalIn increase and Bust, the authors draw at the common background of Australia’s charismatic birds to discover the family members among fauna, humans and setting. they give thought to altering principles approximately deserts and the way those have helped to appreciate birds and their habit during this driest of continents.

Chasing Monarchs: Migrating with the Butterflies of Passage

The monarch butterfly is our best-known and best-loved insect, and its annual migration over hundreds of thousands of miles is a rare typical phenomenon. Robert Michael Pyle, "one of America's best usual heritage writers" (Sue Hubbell), set out past due one summer time to stick with the monarchs south from their northernmost breeding floor in British Columbia.

Extra resources for Arctic Shorebirds in North America : a Decade of Monitoring

Sample text

During courtship, egg-laying, and early incubation, breeding shorebirds vary in their tendency to approach observers from beyond the range of high detectability. For example, once a nest site has been selected, both members of a Whimbrel pair (including the incubating bird) may alarmcall and approach an observer, while in other species, a cryptic strategy is employed. Even among the latter species, however, their behavior can change radically when eggs are hatching and when adults are tending broods; alarm-calling adults may converge on observers from dozens, or even hundreds, of meters away.

27), but that estimate should be interpreted with caution. Near the coast of the Yukon–Kuskokwim Delta, nests are almost exclusively situated in the drier and higher patches of moist tundra (B. J. McCaffery, pers. ), so the birds recorded as breeding in wetlands were probably nesting outside of the plots where they were detected. Although the exact value of our point estimate may therefore be suspect, the most important inference to be drawn from our Ruddy Turnstone data is that, relative to other breeding shorebirds in the YDSA, the species is quite rare.

This suggests that there may be a systematic difference between estimates generated by the two approaches. A more detailed discussion of our results in relation to those of Morrison et al. (2006) is provided in Bart and Smith (chapter 14, this volume). Here we simply note that in many areas and for many species, including cases in which the problems described above were much reduced, our surveys suggested larger populations than estimated by Morrison et al. (2006). Importance of Western Alaska for Breeding Shorebirds Even a relatively conservative assessment of our results shows the significance of western Alaska to continental, and indeed global, shorebird populations.

Download PDF sample

Rated 4.52 of 5 – based on 46 votes